Method of repairing, widening, and resurfacing concrete roads



May 8, 1934. J. w. ISETT 1,957,596

- METHOD OF REPAIRING, WIDENING, ANDRESURFACING CONCRETE ROADS FiledJune 17, 1933 F29. Z

2 SheetsSheet 1 May 8, 1934. J w T-r 1,957,596

METHOD'OF REPAIRING, WIDENING, AND RESURFACING CONCRETE ROADS Filed June17, 1933 2 Sheets-Sheet 2 Job 72 Zdarren J36 Z'Zj QyZiw/QW M M PatentedMay 8, 1934 UNITED STATES PATENT OFFICE METHOD OF REPAIRING, WIDENING,AND RESURFACING CONCRETE ROADS This invention relates to a novel andeflicient method of repairing, widening and resurfacing concrete roads.

The object of the invention is to provide a method whereby new concretemay be anchored to existing parts of a concrete road in the processes ofwidening, repairing and resurfacing of such roads, without the necessityof excavating under the existing concrete road and pouring concreteunder the exposed portion to form a base for holding the new sectionagainst the old concrete. The advantages of my improvement includegreatly reduced cost and increased efficiency. -The cost of laborrequired to dig back under the old road and the cost of the additionalconcrete required to fill in under the old concrete are saved.

Another object is to devise a method for accomplishing the purposesstated, whereby the dura- 2O bility of the road is greatly enhanced,sagging of the new sections is obviated, and pulling away of the newfrom the old concrete is avoided.

Other objects and advantages will appear from the following descriptionof my invention.

In the drawings:

Fig. 1 shows a section of a concrete road which has been widened, andone form of anchoring device for use in widening roads by my process,the view being taken on the line 1-1 of Fig. 2.

Fig. 2 is a plan view, on a smaller scale than Fig. 1, of a concreteroad which has been widened by the addition of new concrete by mymethod.

Fig. 3 is a vertical sectional view of a curb to which has been anchoreda road section.

Fig. 4 is a view similar to Fig. 3, showing a concrete road to which agutter has been anchored by my method.

Fig. 5 is a perspective view showing the use of my method in repairing aconcrete road.

Fig. 6 is a plan view of a concrete road in process of being widened andresurfaced by my method, and Fig. 7 is a vertical section of the same,taken on the line 7-7 of Fig. 6.

In that embodiment of my invention shown in Figs. 1 and 2, the existingor old concrete road to be widened is indicated at 10 and the newsection at 11. A cylindrical hole 12 is bored in the edge 13 of the oldconcrete 10, preferably but not necessarily about midway between the topsurface 14 and the bottom 15. An anchoring device is positioned in thehole 12 and firmly fixed therein. I preferably employ expansion boltsfor this purpose, one example of which is shown in the drawings andcomprises a bolt 16 with hook end 17, head 18, lead alloy sleeve 19 andhard metal cone 20. The bolt 16 carrying the, sleeve 19 and cone 20 isinserted into the hole 12, head first,

and by means of a suitable tool (not shown) the cone is forced into thesleeve, thereby expanding the sleeve and causing it to be firmly wedgedagainst the walls of the hole 12. The bolt and book end 17 protrude fromthe hole 12 in the concrete 10 any desired length.

It will be understood that the anchoring device shown and described isonly one of many which may be used. Hard metal bolts, either straight orhooked, having smooth or deformed surfaces,

and held in position by either hard or soft met or jute compositionsleeves and cones, may be used. In fact, any device having the requiredrigidity and-strength, provided with means for fastening it to oldconcrete, and projecting from said old concrete, may be used inpracticing my method of widening, repairing and resurfacing concreteroads.

Preferably the anchoring devices 16 used in practicing my method ofwidening old concrete roads have ends 17 forming hooks of 180 bend,

and are fixed in holes 12 spaced about four feet apart in the side edgeof the old concrete.

in the drawings.

Other reinforcing means may also be associated with the anchoringdevices, as

for example, wire or expanded metal mesh or mats.

Finally the new concrete 11 is poured onto the foundation adjacent theold concrete.

If no expansion joints are used between the new and the old concrete,the new will become an integral pa of the old, and, either with orwithout expansion joints, the new section will be tied to the old in isuch manner that it will not sag or pull away from the old.

' In Fig. 3 is shown the use of my process in connection -with a curb 22and new concrete section 23, the anchoring device being similar to thatheretofore described. Fig. 4 illustrates the use of the process inanchoring a new gutter 24 to the a old concrete road 25.

The process of repairing a concrete road is illustrated in Fig. 5, inwhich the old concrete 26 has a holedefined by the edges 27. Cylindricalholes are bored in the edges 27, as heretofore explained, and anchoringdevices are fixed therein so as to protrude into the area to be repaireIn this embodiment I prefer to use expansion bolts 28, having ends 29 atright angle to the bolt shank, and in the same horizontal plane as theshank of the device. However, other anchoring means may be substituted.Reinforcing rods, mesh or mats may be supported on the protruding partsof the anchoring devices, if desired. New concrete is poured into thespace between the edges 27, covering the anchoring devices, and when thesame has become rigid, the new section will be firmly anchored to theold, and will remain in its proper horizontal plane relatively to theold concrete.

In Figs. 6 and 7, the use of my process for widening and resurfacing aconcrete road is illustrated. Cylindrical holes are bored in the top ofthe old concrete road 30 and also in the edge at the side to be widened.Expansion hook bolts,

90 bend, indicated at 31 are preferably positioned in the holes formedin the top surface of the concrete 30, usually arranged on thirty inchcenters. Expansion hook bolts 32 with curved hook ends 33, such asheretofore described, are' preferably used in the side edge, usuallyfour feet apart. Reinforcing mesh 34 is supported by and anchored to thebolts 31, short tie wires being preferably used for tying the mesh 34 tothe bolts 31, and similar mesh or other reinforcing means 35 isconnected to the hook bolts 32 at the side of the old concrete. Ifdesired, the mesh 34 may extend over the side edge of the old concreteand serve to reinforce the widened section.

New concrete 36 is then poured on the top surface of the old concrete 30and on the foundation adjacent the side edge, to the-desired height andwidth, covering the bolts 31, 32 and the reinforcing mesh 34, 35. Theold road 30 is thus widened and resurfaced by new concrete 36 whichbecomes an integral part of the old and is firmly anchored thereto andprevented from sagging and separatmg.

I claim:

1. The method of widening and repairing concrete roads without diggingback under the old concrete, which comprises boring a plurality ofhorizontally spaced apart holes in the edge of the existing concreteroad, securing an anchoring device in each hole with one end of theanchoring device protruding from the hole, and pouring new concreteadjacent the edge of the old to a desired height and width and to coverthe anchoring de- VlCeS.

2. The method of widening and repairing concrete roads which comprisesboring a plurality of horizontally spaced apart holes in the edge of theexisting concrete road, securing a hooked end expansion bolt in eachhole, with the hooked end protruding fromthe hole, placing a reinforcing95 rod on the shanks of the expansion bolts, within the hooked ends,longitudinally of the road edge, and pouring new concrete adjacent theedge of the old to a desired height and width and to cover saidexpansion bolts and reinforcing rods. I

3. The method of widening and repairing concrete roads which comprisesboring a plurality of horizontally spaced apart holes in the edge of theexisting concrete road, securing a hooked end expansion bolt in eachhole, with the hooked end 105 protruding from the hole, attachingreinforcing mesh to the expansion bolts and arranging the mesh in asubstantially horizontal plane across the area to be widened, andpouring new concrete adjacent the edge of the old concrete to a desired1] '3 height and width and to cover said expansion bolts and mesh.

JOHN WARREN ISE'I'I.

